Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends
Anthropogenic influences have led to a strengthening and poleward shift of westerly winds over the Southern Ocean, especially during austral summer. We use observations, an idealized eddy-resolving ocean sea ice channel model, and a global coupled model to explore the Southern Ocean response to a st...
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Online Access: | https://doi.org/10.1029/2019GL082758 http://ecite.utas.edu.au/148782 |
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ftunivtasecite:oai:ecite.utas.edu.au:148782 2023-05-15T18:18:19+02:00 Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends Doddridge, EW Marshall, J Song, H Campin, J-M Kelley, M Nazarenko, L 2019 application/pdf https://doi.org/10.1029/2019GL082758 http://ecite.utas.edu.au/148782 en eng Amer Geophysical Union http://ecite.utas.edu.au/148782/1/148782 - Eddy compensation dampens Southern Ocean sea surface.pdf http://dx.doi.org/10.1029/2019GL082758 Doddridge, EW and Marshall, J and Song, H and Campin, J-M and Kelley, M and Nazarenko, L, Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends, Geophysical Research Letters, 46, (8) pp. 4365-4377. ISSN 0094-8276 (2019) [Refereed Article] http://ecite.utas.edu.au/148782 Earth Sciences Oceanography Physical oceanography Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1029/2019GL082758 2022-08-29T22:18:36Z Anthropogenic influences have led to a strengthening and poleward shift of westerly winds over the Southern Ocean, especially during austral summer. We use observations, an idealized eddy-resolving ocean sea ice channel model, and a global coupled model to explore the Southern Ocean response to a step change in westerly winds. Previous work hypothesized a two time scale response for sea surface temperature. Initially, Ekman transport cools the surface before sustained upwelling causes warming on decadal time scales. The fast response is robust across our models and the observations: We find Ekman-driven cooling in the mixed layer, mixing-driven warming below the mixed layer, and a small upwelling-driven warming at the temperature inversion. The long-term response is inaccessible from observations. Neither of our models shows a persistent upwelling anomaly, or long-term, upwelling-driven subsurface warming. Mesoscale eddies act to oppose the anomalous wind-driven upwelling, through a process known as eddy compensation, thereby preventing long-term warming. Article in Journal/Newspaper Sea ice Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Austral Geophysical Research Letters 46 8 4365 4377 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical oceanography |
spellingShingle |
Earth Sciences Oceanography Physical oceanography Doddridge, EW Marshall, J Song, H Campin, J-M Kelley, M Nazarenko, L Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends |
topic_facet |
Earth Sciences Oceanography Physical oceanography |
description |
Anthropogenic influences have led to a strengthening and poleward shift of westerly winds over the Southern Ocean, especially during austral summer. We use observations, an idealized eddy-resolving ocean sea ice channel model, and a global coupled model to explore the Southern Ocean response to a step change in westerly winds. Previous work hypothesized a two time scale response for sea surface temperature. Initially, Ekman transport cools the surface before sustained upwelling causes warming on decadal time scales. The fast response is robust across our models and the observations: We find Ekman-driven cooling in the mixed layer, mixing-driven warming below the mixed layer, and a small upwelling-driven warming at the temperature inversion. The long-term response is inaccessible from observations. Neither of our models shows a persistent upwelling anomaly, or long-term, upwelling-driven subsurface warming. Mesoscale eddies act to oppose the anomalous wind-driven upwelling, through a process known as eddy compensation, thereby preventing long-term warming. |
format |
Article in Journal/Newspaper |
author |
Doddridge, EW Marshall, J Song, H Campin, J-M Kelley, M Nazarenko, L |
author_facet |
Doddridge, EW Marshall, J Song, H Campin, J-M Kelley, M Nazarenko, L |
author_sort |
Doddridge, EW |
title |
Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends |
title_short |
Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends |
title_full |
Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends |
title_fullStr |
Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends |
title_full_unstemmed |
Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends |
title_sort |
eddy compensation dampens southern ocean sea surface temperature response to westerly wind trends |
publisher |
Amer Geophysical Union |
publishDate |
2019 |
url |
https://doi.org/10.1029/2019GL082758 http://ecite.utas.edu.au/148782 |
geographic |
Southern Ocean Austral |
geographic_facet |
Southern Ocean Austral |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_relation |
http://ecite.utas.edu.au/148782/1/148782 - Eddy compensation dampens Southern Ocean sea surface.pdf http://dx.doi.org/10.1029/2019GL082758 Doddridge, EW and Marshall, J and Song, H and Campin, J-M and Kelley, M and Nazarenko, L, Eddy compensation dampens Southern Ocean sea surface temperature response to westerly wind trends, Geophysical Research Letters, 46, (8) pp. 4365-4377. ISSN 0094-8276 (2019) [Refereed Article] http://ecite.utas.edu.au/148782 |
op_doi |
https://doi.org/10.1029/2019GL082758 |
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Geophysical Research Letters |
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46 |
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8 |
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4365 |
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4377 |
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1766194858498719744 |